Pass --error-level=all to puppet-lint

Summary: Without explicitly passing --error-level=all to puppet-lint, the configuration file for puppet-lint could contain --error-level=error. This would limit the ability of arc lint to detect linter issues and therefore we should override this flag from the command line explicitly.

Test Plan: This is mostly theoretical.

Reviewers: epriestley, Blessed Reviewers

Reviewed By: epriestley, Blessed Reviewers

Subscribers: Korvin, epriestley

Differential Revision: https://secure.phabricator.com/D11316